Camera and the like



Nov. 24 1931. p. c. BEIDLER ETAL 1,333,668

F CAMERA AND THE LIKE Original Filed May 13, 192.7 5 Sheets-Sheet l Nov. 24, 1931. D. c. BEIDLER ET AL 1,833,668 I CAMERA AND THE LIKE Original Filed May 13, 1927 5 Sheets-Sheet 2 and/dd? 61??? a a 622 1931- D. c. BEIDLER ET AL 1,833,668

CAMERA; AND THE LIKE Original Filed May 15, 1927 5 Sheets-Sheet s jaw 2 55 ZZZ W Q fivefifar." ma/a 6? L zy??? Nov. 24, 1931.. D. c. BEIDLER ET AL CAMERA AND THE LIKE ori mal Filed May 13, 1927 I 5 Sheets-Sheet 4 Nov, '24, 1931.

. DLC. BEIDLER ET AL CAMERA AND THE LIKE Original Filed May 13. 1927 5 Sheets-Sheet 5 provements in portrait cameras of the gen- .eral type disclosed in Letters Patent of the United States No. 1,528,464 which was is- Patented M1931 UNITED ST T S PATENT, ,oFI-lcE "Domino (2. m moms .L-

or raw-Your. sam aamma, mum-m:

Substitute for application Serial Io.- 191.184 flled-Iay 13,- 1027; I rm. application fled August 1980.

- Serial Io. 479,074. i.

' Thisinvention has to dowith certain provements incameras and the like. The invention has reference particularly to imsued to us March 3, 1925; butit will-presently appear that certain of-the features herein disclosed are not limited to use in vcameras of the foregoing or any other particular type.

Inasmuch however, as the features of the 7 present invention have been devised espe'-' cially with reference to cameras of the fore- :going-general type, we will make reference, "to .the same; but in so doing, we wish it distinctly understood that we do not thereby intendv to limit ourselves nor the usefulness of the'features of the present invention, except in so faras we may do so in the claims.

In cameras of the type just referred to,

there are used two companion cameras, one of which is the camera proper wherein the plate or other sensitized surface is located, and the other constituting a finder which is peculiarly related to the camera proper. The cameras herein disclosed are especially in-' tended for'executing very fine portrait; work and especially for executing pictures of rela-, tively young children and babies, who are so immature that it is diflicult if not impossible to have them pose for a suflicient length of time to enable the photographer to substitute the plate and take the picture after establish- Ling the desired focus. 1

Cameras embodying .the featur of the present invention are provided with duplicate lenses and image surfaces located an equal distance apart so that (in licate images ,are formed on the image sur aces. One of these surfaces is the sensitized. surface of the true camera, and the other is the image plate of the finder camera. These two'cameras are alwaysjworked in such harmony that their focal lengths are always equal and further more, they are always directed at a common object. That is to say, their focal lengths cmayfbeadjusted, but being adjusted, the

focal lengths of both" elements are always equal; and furthermore, both'elements always' maintain focus onia common object conditions, it follows that if the lengths of both elements are adjusted'to either increase or decrease them, the focal axes of 1.. assrenona 1-0 the two elements must be deflected towards v or from each other 'so as to maintain focus on a given object. If that object is moving back and'forth with respect td the position of the camera, the focal lengths of the two elements are correspondingly adjusted and furthermore the two axesare deflected back and forth with respect to each other in proper vharmony.

Both of the elements areso arranged that their rear ends remain in substantially in focal length being position, the variatio accomplished by bac andforth movements of the front endsaccompanied by the proper movement of saidifro'nt ends towards or from each. other. This makes it ossible to secure.

the desired adjustments wit out unnecessary make provision. for tilting the rear and pertions of the units in exact harmony by means of the very simple construction so that the necessary adjustments of the image surfaces with respect to the vertical plane may be effected. I 3

In connection with the foregoing, it is an object to provide a very simple form of con-- struction, and one whereby the imag'esurfaces "of the two units may be harmoniously moved regardless of the focallengths adjustmentsp v a t further feature of the invention relates to theprovisionjof an improved'form of construction for'shifting' the front or lens ends arrangement being provided with an oper-- atin handle or knob which is very convenfor shifting the front or lens ends towardsof the units back and forth in harmony, this 95 ient y located with respect to the positlon of and from each other in proper harmony as the back and forth movements are efiectedn This improved construction is such that a very rigid structure is provided, one which 6 can be cheaply built, and one which will be very accurate and positive in its operations A further object in connection with the foregoing is to provide an arrangement whereby the foregoing mechanism may be so the no or harmony of move- 'aoiished, thus melting it tl'ie device into proper adcases in which a slight male found.

of the invention relates ans whereby the varir, .iveniently mounted upon is platform, which in turn may be supported upon and connected to any convenient form of stand, such for example as that illustrated in our c-o-pending application for Letters Patent of the United States on improvements in stands for cameras and the like, Serial No 185,179, executed April 14th, 1927, and filed the United States Patent Qfiice April 20, 192?.

Anotlierfeature of the invention relates to the provision of an improved construction of hood or acket for use in connection with the finder or ground glass image surface. This hood is so constructed that it will normally return to a central position wherein the central portion of the image field is directly visible, but the hood is spring supported so that it can be readily deflected from side to possible to or' g in those side or back and forth in order to bring into I line with other portions of the image field which are to be examined in detail.

It is a further object in connection with the foregoing to provide a hood which is very simple of construction, and can be readily attached to finders of types now in extensive Other objects and uses of the invention will appear from a detailed description of the same, which consists in-the features of construction and combinations ofparts hereinafter described and claimed.

In the drawings:

Figure 1 shows a plan view of the entire camera structure Figure 2 shows a side elevation corresponding to Fig. 1, a portion of the finder being broken away and also the hood being shown in vertical section;

Figure 3 shows a plan view of the principal operating mechanism for securing the necessary adjustment, being taken substantially on the line 3-3 of Figure 2, looking in the direction of the arrows;

Figure 4 shows a section through the mechanism for securing the back and forth movements, being taken substantially on the line 4-4 of Figure 3, looking in the direction of 65 the arrows, but on enlarged scale;

essence Figure 5 is a detailed section the line 5-5 of Figure 4, looking in the direction of the arrows;

Figure 6 is a detailed section on the line 6-6 of Figure l, looking in the direction of the arrows; 1

Figure 'l is a detailed s ction on the line Z-Z( of Figure looking the arrows;

Figure 8 is a detailed sectio- 88 of Figure 4, looking v the arrows;

Figure 9 is a fragmentary v of the lower portion of one of t e nits showing the guide arrangement fol enting the same from lifting away c is platform, being a fragmentary section on the line 9-9 of Figure 1, looking in the direction of the arrows, but on enlarged scale;

Figure 10 shows a fragmentary cross sec tion on the line 10-10 of Figure-9, looking in the direction of the arrows;

Figure 11 shows a fragm section on the line 11-11 of ing in the direction of the arrow larged scale;

Figure 12 shows a the line 12-12 of direction of the a; and may also be consid line 12-12 of Figure 1 tion of the arrows;

Figure 13 shows a c; d guide screw at the top end or in Figures and L 1 s, out en- J'G iiljlg in the direcview of the the device shown Figure 14: SllOWS detailed perspective view f the guide block which is engaged by the screw illustrated in Figure 13;

Figure 15 shows a detailed section on the line 1515 of Figure 2, looking in the direction of the arrows, but on enlarged scale; a d

Figure 16 shows a detailed section on the line 1616 of Figure 3, looking in the direction. of the arrows, but on enlarged scale.

In the drawings the two camera units are designated by the numerals l5 and 16 respectively. One of these is a true camera in which the plate or other sensitized surface is exposed and the other is a finder camera. In the construction illustrated 16 is the true camera and 15 is the finder camera. Each of these is provided with the customary lens 17 which can be moved back and forth with respect to the image surface, a collapsible bellows or the like 18 being provided in the customary manner. a

The adjustments of focal lengths are made by shifting the front or lens end back and forth while keeping the rear or image surface at a fixed point. It isth'erefore desirable to provide for back and forth adjustment of the front or lens ends of the two elements I to swing the focal axes outwardly and bring 1,eas,eea

is necessary to swing vertical'pivotal axes at the rear or image plane ends of the units. Thus, as the units are focused on objects close at hand, the focal axes must be swung towards each other, Whereas, as the units-are focused on objects more distantly removed it becomes necessary them more nearly into parallelism.

In order to provide for the foregoing adjustments, each of the units has its rear end portion "(usually in the form of a box) piv oted on a vertical central axis. These are the boxes 19 and 20 best shown in Fig. 1. They are carried by bracketsincluding the vertical side plates 21 which reach upwards from the, rear frame members 22 and 23 (see Fig. 3).

These rear frame members are pivoted at the points 24 and 25 to a common platform '26 which in turn may be supported upon a. convenient stand or table, carried by a suitable device such as a tripod. This platform 26 is 31 and 32. These pairs are joined together at their front ends by the cross blocks 33 and 34 corresponding to the two units respectively. The pairs of tubes constitute horizontal rails upon which are slidablymounted Q bracket frames '35 and 36 correspondin to the two units respectively. Each of t ese bracket frames includes a cross member 37 and a rear member 38. The members 37 and 38 of each frame are joined together bythe side pieces 39 and 40, the front ends of which reach upwardly as best shown in Figures 2 and 11 so as to establish supports for the front pieces 41 and 42 of the two units 15 and 16. The lenses 17 are carried by these front. pieces 41 and 42 in the-usual manner.

It is thusevident that by shiftingthe frames 35 and 36 back and-forth on the tubular rails the two'units 15 and 16may be lengthened or shortened; and by swin ingthe front ends 33 and 34towards and om each other the frames will be caused to'pivot' on the rear pivots 24 and 25, respectively.-

The front blocks 33 and 34 are grooved as shown in Fig. 10 with the'curved grooves 43 which are closed at their lower sides bythe plates 44. The stationary frame 26 is provided at its front edge with. clips 45 which reach into the grooves 43 and prevent the front ends 33 and 34 of the two swinging frames from lifting away from-the platform 26, while said front ends to swing freely about the pivotalpoints 24 the focal axes about and 25. The swinging frame members 33 and 34 are (provided with pins 46 and 47 which exten the outward swing of the two camera sections by permitting them to swing towards each other without interference.

across the grooves 43 and limit Each of the frames 35 and 36 is. rovided with apair of central blocks 48 an 49 (see Figures 3 and 12'), which are slightly sepaembers 51 and 52 respectively are u The top bracket member 51 has an upstand ing stud or post 55. The bottom bracket 52 has connected thereto a U-shaped clip 5.6, the same being secured by a screw 57.

Carried by the platform 26 are the two a guide bars 58 and59 corresponding to the two frames 35 and 36 see Fig. 3 in articular). Therear ends 0 these guide ars are carried by bracket plates 60, and the frontends thereof are carried by the bracket plates 61, all of said. bracket plates being suitably connected to the platform 26. These bracket plates are also preferably slotted transversely and the endsof the gui e bars 58 and 59 are connected to the brackets'by through bolts reaching through said slots. Consequently the exact ositions of the ends of the guide bars may e readily adjusted so as to insure the exactcontrol of the movementsof the brackets 35 and 36.

The clips 56 already referred to on the frames 35 and 36 engagethe guide bars 58 and .59 so that as the frames 35 and 36 are moved back and forth they are also compelled to swing towards or from each other on the pivotal points 24 and 25. -The necessary clearances may be allowed in the clips 56 to take care of slight angularity in such movements or the clips may be allowed to turn slightly on the screws 57 purpose.

In order to cause movements of the frames 35 and 36 we have provided a slidable frame memberv 62 best (seeFigure 12) for this the back and forthshown in Figures 1 and 3. The same comprises a plate having the side arms 63 and 64 which reach out to the positions of the studs 55 already referred to as being connected with the frames 35 and 3.6 (see Figure'12-). The central portion of the bracket plate 62 slides upon a pair of fvertical plates the sliding bracket plate 62, said top plate being .also connected to the brackets 67 and 68 at a proper clearance above the plates 65 and 66 to allow for the proper sliding of the bracket plate. The bracket plate is probe conveniently rotated. This sh lessees vided on its top surface with a pair f guide bars and 71 at the sides of the top plates 69 so that the bracket plate 62 is prevented from rocking or oscillating as it slides back and forth.

By reason of the above construction, the bracket 62 is compelled to slide back and forth with a truly rectilinear movement and a line drawn through its outer ends always lies at right angles to the direction of movement of the bracket.

The outer ends of the bracket are slotted.

as shown at 72 and T55 (see Figure 3 in particular) and blocks 74- are et into these slots, these blocks resting upon the tops of the studs 55 already referred to (see Fig ures 12 and 14). The fiat head screws 'Z5 pass through the blocks 74 and into the studs 5.3 the heads of said screws overlying the edges of the slots Tu and 73 of the bracket plate 62 so that the parts can not become disengaged. If desired, the flat head screws 75 may be provided with a squared or rectangular shank portion 70 as shown in Figure 13, the same when used serving to prevent the screws from being drawn up too tight and thus preventing any binding action" Lying bet-ween the side plates 65 and 66 there are the rear sprocket wheel 7'? and. the front idler 78 (see Figure 4i}; the chain 79 passes over the sprocket and idler. lying between the plates 65 and The sprocket T7 is carried by a control shaft 80 which reaches across the platform to the left hand side thereof and its projecting end carries a knob 61 by means of which it can 80 is suitably journaled in a bracket 82 at the left hand side of the platform 26.

A stud or screw 83 reaches downthrough the center of the bracket plateand through one of the links of the chain; being secured in place by a pair of lock nuts 84. The screw 83 is conveniently a fiathead screw and is counter sunk in the bracket plate 62 and is placed beneath the top plate (59 as best shown in Figure 'l.

By means of this arrangement the turning of the knob 81 which is convenient of access to the operators left hand causes the bracket 62 to move back and forth, thereby simultaneously moving the front lens ends of the two units back and forth in perfect harmony. Due to the guide rail construction already explained, said frontends are also swung towards or from each other in proper harmony so that a common object is always kept in focus and furthermore it is possible to make preliminary adjustments so as to perfectly insure this result.

Inasmuch as the image surfaces remain substantially stationary during the foregoing adjustments (the only movement being a very slight angular movement on the pivot points 24 and 25), it follows that the operator can very easily watch the image surface of the finder unit and c I very readily make his adjustme bring and keep the object in pei Thus, for example, in running around or playi enabled to follow the chilo 0 mo tinuously and perfectly both. movements towards and fro well as movements back and down. The former are foil manipulation of the knob or the lenses back and forth; a or up and down move by. changing the direction of camera by proper mani or form 26.

In order to'provide for p the upper and lower portions or image surfaces can be rocked abs tal For this purpose l9 and 20 of the camera units the central horizontal-axes i the bracket arms 21 alread 84:. These are engaged by p two shafts 85 and 86 of the tively. These shafts are a universal coupling 8? a n diate between the lower por so that is turning a single k 0a to on one or the other of the t 86, both SllliiZS are coi'npelled to son and thus both of the su- .ac i simultaneously tilted.

The universal coupling 8? includes the sections 90 and 91 on the two shafts, together with a central block 92 to which the me 90 and 91 are connected by pivots established by the screws 93; and. the members 90 and 91 are preferably slotted where the screws 33 pass through so as to take care of slight back and forth movements which may be occasioned when the camera units are tilted on the pivotal points 24 and 25.

If desired, a snap device may be provided for normally retaining the camera boxes 19 and 20 in the vertical position on the horizcntal pivotal points. For example, one of the bracket arms 21 adjacent to each of the camera boxes may be'perforated to receive a small steel ball 93 (see Figure 15) which ball is normally pressed inwards by a spring clip 93* and against a plate 93 on the lower portion of the camera box. This plate is in turn provided with perforation or socket 93 into which the ball will drop at the instant of vertical alignment of the camera box.

It may also be found advisable to place a resistance or brake on each of the shafts 85 and 86 so as to normally retain the same against rotation with a sufficient amount of ere 1',saa,eca 5 resistance to kee the parts roperly aligned 105 has its u per edge 106 connected to the once they haven brou ht mto position. hood 100 an its lower edge107 ls'draped For this purpose a small iction brake 93 (see Figure 16) may be clamped around each of said shafts, being tightened up to the necessary amount by a screw 93.

Ordinarily the finder unit19'wi1l be provided with a finder 94 o n.at its to edge 95 and provided with a that the operator will see the image from said surface 96.

The finder 94 is .conveniently attached to the rear end 19 of the finder unit by means of hood pins 97 at thelower end of the unit 19 together with clips 98 at the upper end thereof. These clips 98 in turn snap over pins 99 on the top edge of the finder 94 whereby the latter may be conveniently snapped into place or readily disengaged. .7

It is customary to use a suitable cloth hood or the like'in conjunction with the finder 94 so as to cutout interference'from extraneous illumination and also to concentrate the at able material suchashardrubber, bakelite,

provided an improved construction of hood to be used in connection with the finder 94. The same includes a face mask 1000f suitable shape and size to accommodate theeyes and forehead and the upper portion of the operators face when set down against the upper edge 101 thereof. This mask is made of suitwood, or other material and preferably the cloth sufchas velvet. Joining the hood 100 to the upper portion of the finder 94 is a. series of spiral springs 102 (preferably four in number, one at each corner of a rectangular structure, only two being illustrated inFigure 2). I

- These springs nected to plates 102" (see Fig. 2) there being one such plate at each side of the finder 94.

Each of the plates 102 has oneend longitudinally slotted as shown at 102 and the other end transversely slotted s shown at 102 so thatv said plates can be their rear ends with pins 102! and then turned down to engage their front ends with pins 102. The lower ends of springs 102 are connected to the plates 102 by the use of pins 103; and the upper ends of said springs are connected to the hood 100 by the use of pins 104. As a result thereof the hood 100 can be moved around sidewise or back and forth with considerable freedom, with respect to Preferably a cloth or light proof shield e 96 so. reflected have their lower 'ends conily engaged at 1 around the upper portion of the finder 94.

The forward portion 108 of the lower portion 107 is preferably connected to the rear portion 19 of the finder unit or to the u r portion of thefinder 94 as illustrated in igure 2 so as to prevent the same'from falling attachment theretomakes it possible for the same to slide back and forth as the face mask.

' is moved around.

- It will also be noted that the support of the mask 100 by means of the spiral springs is such that said mask will not be premed- -'straight down without exerting an undue force thereon,'so it is retained at a if distance from the position of the re roper ectmg surface 96 as itris moved around.

Although we have herein disclosed a certain improved form of hood, still we have not claimed the same in the present-applicationinasmuoh as the same is claimed in our application for patent on improvements in hoods for camera finders and the. like, Serial .No. 294,718, filed July 23, 1928 and patented November 26, 1929, as No. 1,73 ,038. In like manner, although we'h'ave herein disclosed a new and improved form of tilt-back, mill we do not claim the same in this case inasmuch as the same is claimed in our copending application for tilt-backs for cameras and the upper edgethereof is faced with suitable While we have herein shown and described only a single embodiment of the features of ourpresent invention, still we do not intend to -limit ourselves thereto except as we may do so in the claims.

- Weclaim:

.1. In a camera of the type described, the

combination of a platform, a pair of com-' panion rear frame members located side by side adjacent to the rear edge of saidplatform, pivotal connections between said frame members and the platform, a pair of parallel guide rails on each frame member extending forwardly therefrom andvlocated above the platform, cross pieces connecting together the.

front ends of the pairs of guide rails aforesaid, cooperating guide means on the front portion of the platform and on said cross piecespermitting back and forth swinging movement of the frame members together with the guide rails-and crm pieces while retaining the same against movement upward away from the platform, a slide member mounted on. the guide rails of each frame member, a downwardly extending guide clip on each slide member, guide bars on the platform having their front portions converging towards each other, the clips of the slide members engaging the respective guide bars and being guided thereby as the slide members are moved on the guide rails, means for adjusting said guide bars on the platform to thereby adjust the co-operating movements of the slides due to engagement with the guide bars, amovable frame member on the platform, outwardly reaching arms on said frame member, pin and slot connections between said arms and the slide members. aforesaid operative effectively to shift the slide memb-ers back and forth as the frame member is moved. back and forth, means for guiding the frame member in its back and forth movements, to thereby insure rectilinear movements thereof, a control shaft journaled on the platform, a sprocket on the same, a chain operated by said sprocket, a connection between said chain and the movable frame member, whereby rotations of said shaft serve to shift the frame member back and forth, upstanding brackets on the rear frame members, camera boxes pivotally mounted on said brackets and capable-of tilting movement about horizontal axes, shafts ournaled on the rear frame members aforesaid, rack and inion connections between said shafts and t e lower portions of the camera boxes,

a universal joint connection between the inner ends of the two shaftsaforesaid, including slip connections in said universal joint permitting slight axial adjustments while maintaining the two shafts in angular relation at all times, whereby both of said shafts may be rotated simultaneously to adjust the tilt of both boxes simultaneously, suitable lens elements carried by the slide members and suitable bellows'connections between the res ective lenses and the camera boxes, substan-v wardly extending guide clip on each slide member, guide bars on the platform having their front portions converging towards each other, the clips of the slide members engaging the respective guide bars and being guided thereby as the slide members are moved on the guide rails, means for adjusting said guide bars on the platform to thereby adjust the cooperating movements of the slides due asaaeee to engagement with the guide bars, a movable frame member on the platform, outwardly reaching arms on said frame member, pin and slot connections between said arms and the slide members aforesaid operative effectively to shift the slide members back and forth as the frame member is moved back and forth, means for guiding the frame memberin its back and forth movements, to thereby insure rectilinear movements thereof, a control shaft journaled on the platform, a sprocket on the same, a chain operated by said sprocket, a connection between said chain and the movable frame member, whereby rotations of said shaft serve to shift'the frame member back and forth, upstanding brackets on the rear frame members, camera boxes pivotally mounted on said brackets and capable of tilting movement about horizontal axes, shafts journaled on the rear frame members aforesaid, rack and pinion connections between said shafts and the lower portions of the camera boxes, a universal joint connection between the inner ends of the two shafts aforesaid, including slip connections in said universal joint permitting slight axialadjustments while maintaining the two shafts in angular relation at all times, whereby both of said shafts may be rotated simultaneously to adjust the tilt of both boxes simultaneously, suitable lens elements carried by the slide members and suitable bellows connections between the re-' spective lenses and the camera boxes, sub

extending forwardly therefrom and located above the platform, cross pieces connecting together the frontends of the pairs of guide rails aforesaid, a slide member mounted on the guide rails of each frame member, a downwardly extending guide clip on each slide member, guide bars on the platform having their front portions conver g towards each other the clips of the slidd members enga 'ng the respective guide bars and being gui ed thereby as the slide members are movedonthe guide rails, means for adjusting said guide bars on the platform to thereby ad'ust the co-operating movements of-the sli as due to. engagement with the guide bars, a movable frame member on the platform, outwardly reaching arms on said frame member, pin and slotconnections between said arms and the slide members afore said operative effectivelyito shift the slide members back and forth as the frame member is moved back and forth, means for guid ing the framemember in its back and forth extending guide clip on each slide'member,

sprocket on the same, a chain operated by said sprocket, a connection between said chain and the movable frame member, where by rotations of said shaft serve to shift the frame member back and forth, upstanding brackets on the rear framemembers, camera boxes mounted on said brackets, suitable lens elements carried by the slide members and suitable bellows connections between the re: spective lenses and the camera boxes, sub stantially as described.

4. In a camera of the type described, the combination of a platform, a pair of companion rear frame members located side by side adjacent to the rear edge ofsaid platform, pivotal connections between said frame members and the platform, a pair of parallel guide rails on each frame'member extending forwardlytherefrom and located above the platform, cross pieces connecting together the front ends of the pairs of guide rails afore-. said, a slide member mounted on the guide rails of each frame member, a downwardly guide bars on the platform having their front portions converging towards each other, the clips of the slide members engaging the re- 1 spective guide bars and being guided thereby as the slide members are moved on the guide rails, means for adjusting said guide bars on the platform to thereby adjust the co-operatingmovements of the slides due1to en agement with the guide bars, a movable rame member on the platform, outwardly reaching, arms on said frame member, pin and slot connections between said arms and the slide members aforesaid operative effectively to shift the slide member back-and forth as the frame member is moved back and forth, means for guiding the frame member in its back and forth movements to thereby insure rectilinear movements thereof, upstanding brackets on the rear frame-members, camera boxes mounted on said brackets, suitable lens elements'carried by the slide members and suitable bellows connections between the respective lenses and the camera boxes, substantially as described. 5. In a camera of the type described, the

combination ofa platform, a pair of com-- panion rear frame members located side by side adjacent to the rear edge of said platform, pivotal connections between said frame members and the platform, a pair of parallel guide rails on each frameflnember extending forwardly therefrom and located above the platform, cross pieces connecting together the front. ends of the pairs of guide rails aforesaid, a slide member mounted on the guide rails of each frame member, guide bars on the platform" having their front portions converging towards each other, co-operating elements on the slide members co-operating with said guide bars, a movable frame member ori the platform, outwardly reaching arms .panion rear frame mcmbers located side by side adjacent to the rear edge of said platform, pivotal connections between said frame members and the platform, a slide member slidably mounted with respect to each frame member, guide bars on the platform having their front portions converging towards each other, co-operating elements in conjunction with the slide members engaging the respective 'uide bars and being guided thereby as the slide members are moved with respect to,

the frame members, a movable frame member on the platform, outwardly reaching arms on said frame member, pin 'and slot connections between said arms and the slide members aforesaid operative effectively to shift the slide members back and forth as the frame member is moved back and forth, and means for guiding the frame member in its back and forth movements to thereby insure rectilinear movements thereof, substantially as described,

' 7.In a camera of the type described, the

combination of a platform, a pair of compamon rear frame members plvotally mounted on the rear portion thereof, slide members. H

slidably mounted with respect to each of said frame members, guide bars on the platform, cooperating elements on the slide members engaging the guide bars to guide the slide members in their back and forth movements, a

movable frame member on the platform, outwardly reaching arms on said frame member, pin and slot connections between said arms and the slide members aforesaid operative effectively to shift the slide members back and forth as the frame member moves back' and forth, and means for guiding the frame member 1n lbs, back and forth movements to thereby insure rectilinear movements thereof, substantially as described.

' 8. In a camera of the type described, the combination of a platform, a pair of companion rear frame members pivotally mount ed on the rear portion thereof, slide members slidably mounted with respect to each of said members, guide bars on the platform, means for adjusting said guide bars with respect to each other, co-operating elements on meee eee the slide members engaging the guifie bars to guide the slide members 121 their back and forth movements means for moving 17116 slide members back and forth in unisen with respect to the frame members, substantially a described DUNALD C. BEIDLER. ANTONIUS J. HKEN. 

